Sewing-machine.



R. L. PLUMLEY.

SEWING MACHINE.

APPLICATION FILED FEB- 14. 1916.

A H P was Q g V Patented Jan.16,1917. W 62 1 ,1 :zijzg;

'OND L. PLEY, OF WILMINGTON, DELAWE, ASSIGNOR T0 5 OF NEW YORK, N. Y., ACO2. MON 0]? YORK.

EDERICK snwme-mao Specification of Letters Patent.

Patented Jan. 1e, teat.

original application filed April 1?, 1915, Serial No. 21,985. Dividedand this application filed February is,

1916. Serial No. 78,110.

To all whom it may concern:

Be it known that I, RAYMOND L. PLUM- LEY, a citizen of the United Statesof America, residing in Wilmington, county of New Castle, and State ofDelaware, have invented certain new and useful Improvements inSewing-Machines, of which the following is a true and exact description,reference being had to the accompanying drawings, which form a partthereof.

My present invention comprises improvements in sewing machines devisedwith the special object of producing what is known as a straw sewinmachine capable of operation at the hig speeds required by modernfactory use, with a minimum of noise and vibration, and with provisionswhereby a necessar adjustment to compensate for wear may e readily andaccurately made.

More specifically my invention comprises improvements in the meansemployed for giving the needle bar of a sewing machine of the typereferred to, its accustomed movements.

The various features of novelty which characterize my invention arepointed out' with and For a better understanding of the invention,however, and the advantages possessed by it,

articularity in the claims annexed to reference should be had to theaccompanyingdrawings and descriptive matter in which I have illustratedand described a preferred embodiment of my invention.

Of the drawings: Figure 1 is a side elevation of a straw sewing machineembodying my invention; Fig. 2 1s a partial section on the line 22 ofFig. 1; and Fig. 3 is a perspective view of a split bushing employed inthe needle lever mounting.

The straw sewing machine shown in the drawings comprises a G shapedframe A, in

the lower portion of which 1s journaled the main shaftlB of the machine.Through an eccentric carried b themain shaft B, and a connecting rod C te usual oscillating movements are imparted in the usualmanner to theneedle lever D which is pivotally supported by'thefixed stud Fadjustably secured to the frame A. The stud F comprisesa tapered portionreceived in the correspond ing tapered passage formed through the hub ofthe lever D, and also comprises a cylin- ,drical body portion F. Fittingabout the orming a part of this specification.

-' cylindrical portion F and with the latter filling the tapered socketA in the frame A,

to compensate for wear by gently tapping with a hammer on the big end ofthe stud F. The nut G, which is ordinarily loosened preparatory to anyadjustment of the stud F, in normal operation is tightened up so thatthe split bushing G is firmly wedged between the cylindrical stud ortionF and the wall of the socket A. S ould the hearing for the lever D bemade too tight in any ad ustment, a light tap or two with a hammer onthe small end of the stud F will loosen the bearing. v

With the construction described, it will be apparent not only that theneedle lever bearing can be easily adjusted to compensate for wear, butthat the connection between the stud F and the frame may be madeabsolutely rigid and unyielding under the operating strains. I

The connecting. rod C is connected to the lever D and to its drivingeccentric by ball and socket joints as is usual in this type ofmachines. With this arrangement there is a tendency for the connectingrod to wabble and rattle. To prevent this I provide helical springs Dwhich act at all times between the upper head of the connecting rod Cand the adjacent portion of the lever D.

As shown, there are two of these springs seated in sockets D andhorizontally disposed one on each side of, and in substantially the samehorizontal plane with the center of the ball and socket connectionbetween the connecting rod C and the lever D. These springs exert abalanced thrust on the upper end of the connecting rod.

The present case is adivision of my application Serial No. 21985, filedApril 17, 1915 in which are described various features of the sewingmachine mechanism illustrated but not specifically described herein assuch descri tion is' unnecessary to an understanding 0 the inventionclaimed herein.

While in accordance with the provisions of the statutes I haveillustrated and vdeskilled in the art that changes can be made in theform of my invention without departing from its spirit, and that somefeatures of my invention can be used without a corresponding use ofother features of the invention.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In a sewing machine, the combination with the needle lever and theframe of a pivotal connection between said lever and 2. In a sewingmachine, the combination with the needle lever and the frame of apivotal connection between said lever and frame comprising a taperedsocket inv said lever, a tapered socket. in said frame, a lever studcomprising a tapered portion fitting in said lever socket and acylindrical extension from the small end of said tapered portion, asplit bushing comprising a body portion fitting about said extension andlocated in and externally tapered to fit in said frame socket, and athreaded extenson from the small end of said bushing, and a nut onsaidthreaded extension and ada ted to engage said frame and draw said busing into the tapered socket thereof.

3. In a sewing machine, the combination with driving and driven elementsof a rod connecting said elements and connected to each by a ball andsocket joint, and a pair of helical springs interposed between one ofsaid elements and said rod and acting on the latter in a directiongenerally parallel to, and at oppositesides of an axis, transverse tothe'length of the rod, of the joint between said rod and last mentionedelement.

4. In a sewing machine, the combination with the needle lever, maindriving shaft and needle lever eccentric carried thereby, of'aconnecting rod and ball and socket connections at the opposite endsthereof with said lever and eccentric, helical springs acting betweensaid lever and connecting rod and extending generally parallel to, andlocated at opposite sides of an axis of the joint between the lever andconnecting rod extending transversely to, and lying in a planetransverse to said rod, said lever being formed with sockets receivingthe corresponding ends of said springs.

RAYMOND L- PLUMLEY.

